Preprocess an Image to remove Noise from the Background

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Pankaja Tanjore
Pankaja Tanjore 2015 年 10 月 15 日
I have an image which contains a Text printed on it. I need to preprocess the image , remove all the noise in background and get a clear binary image for my further processing.
I have applied the following functions and obtained the prepossessed image.
i)Filt_Img=medfilt2(img ,[6 6])
ii)imsharpen(Filt_Img,'Radius',2.2,'Amount',5.6,'Threshold', 0.8);
iii)se = strel('square', 4);
im_close = imclose(b, se);
iv)Icorrected = imbothat(im_close, strel('disk', 20));
v)thresholded = thresholdLocally(Icorrected,[],'PadMethod','symmetric');
But i am not able to fully remove the noise in the background. If i try to clear the noise some portion of the text is removed.
I am sending here the Input Image, Preprossed image and the Threshold image. In the threshold image there is noise at the top near digit 4 and also the first character D is not fully seen. I need to remove that noise and still have the letter D obtained fully.
It would be great if you let me know what are functions to be used to get a clear image without noise.

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